Controller.



No. 884,345. PATENTED APR. 7, 1908.

E. W. STULL. CONTROLLER.

APPLIGATION FILED 0U'l.26, 1907.

2 SHEEN-91mm" 'wwfm m o/tna g I PATENTED APR. 7, 1908.

B. W. STULL. CONTROLLER.

nruonxon rum) 0012.26. 1907.

2 SHEETS-SHEET 2.

Q S k .3 k s M N k N V W Mom 05 UNITED STATES PATENT osiujon mniETT WJsTULL; or NORWOOD, onio, iis'sieivon To'ALLIsoniLiisns COMPAN Y, A COR PORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY;

I 1 A coRPon ioNoF OHIO. I

' Specification ofLetters Patent.

CONTROLLER,

Original application filed March. 31, 1906, Serial No. 309,027 Divided and this application filed October 26,1907.

' Serial No. 399,346.

' lTo allivhom it may concern:

Be it known that I, EMMETT W. STULL, a citizen of the United States, residing at Nor- Wood, in the county of Hamiltonand State of Ohio, haveiinvented certain new and useful Improvementsiii-Controllers, of which the following is a full, clear, and exact specification.

My invention relates to controllers for electric motors and particularly to motor controllers for electric'railway work.

This application isa division of mv co' pending application Serial No.'309,027-: filed March 31, 19 06.

vTheobject of the present invention is to better the arrangement of blow-out magnets so that a more BfilClQlll? action thereof is obtained. In carryingout this object the controller isfprovidedwith a plurality of blowout magnets magnetically in parallel and supplying a common magnetic circuit, the ends of the blow-out magnet cores or extensionstherefrom forming bearings for the shaft of the controller drum. This shaft is of magnetic material. f The blow-out magnetic circuit thus extends by way of the controller shaft to one side of the place where arcing is liable to occur. It preferably returns from the other side of such arcing place by way of extensions of magnetic material from the other pole or poles of the blow-out magnet or magnetsfl ,Plugs of magnetic material may be inserted in the controller drum for properly directing and concentrating the lines of force at the desired circuit-breaking points of invention with the front half of the controller casing removed and with some of the parts in section; F ig, 2 is a partial horizontal section on the line 2' 2 ofl ig. 1 and shows the general arrangement of the blow-out circuit; and Fig; 3 is an elevation of part of the front half of the controller casing looking from the inside, the arc deflector plates being removed.

* In the drawings A is the controller drum,

movable by the usualhandle A and provided with contacts B with which the spring contact fingers C co-act to vary the cOIlllCtlQns be tween the supply circuit and the controlled devices, which may be electric motors. The drum A is mounted on but insulatedfi'ornia shaft D of iron or other magnetic material. Surrounding the drum is a box or casing E, E, E of insulating and refractory material, such as prepared asbestos which may be covered with mica. The parts E and ,E of this box or casing are fastened in place on the main controller, the part E forming a screen 7 be made whenthe drum is rotated. Should any are form between adjacent fingers and attempt to run back along the fingers towards their supports, the shield or screen E through which the fingers extend and which is in the path of the arc will actto cool and thereby break said. arc. Thus destructive and dangerous arcing between the fingers is avoided.

if desired, instead of having the fingers G ex-.

tend through openings in the shield E, they may extend around theedge of said shield.- though with such an arrangement the absolute prevention of the drawing back of-the arcs would not be'secured.

The main controller casing is formed in twoparts, a back part G of iron or other magnetic material. and a front part G of wood or other insulating material, and has a cover W of brass or other non-magnetic material.

A: shown in Fig. '2. the front part G, which is nearest the operatorv 1s made of tongue and groove boards fastened together and strengthened by metallic bands g at the top and bottom. both inside and outside. Extending from the iron part G of the controller casing are two cores H ll" on which are placed coils I l to form blow-out magnets. These coils may be connected in any desired manner.

I-Patented April 7, 1908. i

Core extensions H" H are fastened to the cores H H in any desired manner, as by screws 72, and serve not only as paths for the magnetic flux but also as bearings for the iron shaft D of the controller Thisv I iron shaft D of said drum and outward toward the contacts B, but are not mounted on and. do not touch the shaft itself. These plugs are located so as to be just beneath the circuit-breaking points of the controller or the points where the contact fingers 0 leave the contacts B, and are riveted to small plates K also of magnetic material, these plates serving to spread out the magnetic field across the whole width of the contact finger.

The plates and attached plugs are removably fastened to the contact segments B, as by screws it. These plugs therefore are common pole pieces of the two blowaout magnets and serve individually to concentrate and direct the lines of force at those points respectively where arcing is liable to occur and collectively netic circuit. V v

For still better directing and concentrating the lines of force at the proper points and further diminishing the reluctance of the magnetic circuit, strips of iron maybe mounted inside of the front half G of the controller casing, which when this casing is in place bear against the back half G of the casing and are practically magnetically continuous there with. For better insulation the ends of the strips L are teeted by insulation Z. These strips ex" ind from the iron part of the casing, which is part of the blow-out magnetic circuit, around theinside of the wooden part of the casing until they are over the ends of fingers C. At Z they are bent inwardly to bring them nearer the ends of fingers C. These stri s are the other common polepieces of t e blow-out magnets, of opposite olarity to the lugs K. Thus as shown in ig. 2 the breaking of thecircuit between fingers C and contacts B occurs in a strongmagnetic field between the ends of stri s L and the plugs K. This field is excite the two coils I I magnetically in parallel, and the path of the flux is from the cores H H to the casing G, strips L. across the air gaps to pugs K, shaft D, extensions H H to cores H. The only gaps of any length in this divided paramagnetic path are those between the stri s L and plugs K, in which gaps the circuitreaking takes place. There is one strip L for each finger C and there may be plugs K at each end of each contact B as shown in Fi 2, so that the pro or blow-out action may be obtained at the circuit-breaking points in whichever direction the controllerdrurmis rotated. The various contacts'B are arranged in any desired manner und the shaft D, the connections and ar to diminish the reluctance of the magrangements of these contacts forming nopart of my present invention.

Extending from the part E of the insulating box around the controlling drum are plates T of insulating and refractory material, such as asbestos covered with mica. These plates are s aced apart by insulating tubes and are helc together in a unitary structure by bolts 15, shown as three in number, passing through the tubes and the plates. When in place these plates extend inwardly between each contact finger and the adjacent ones, thus serving to prevent the arc of one contact finger from striking over to another contact finger. One of these contact lates is shown in Fig. 2 below the contact The unitary structure formed by these plates is laced against the in-turned ends of the strips L on the inside of the front half G of the controller casing as shown in Fig. 2, and

is fastened to the plate E, being spaced from the casing by bushings U and the strips L. This set of plates may be held in place by any desired means, as by bolts.

At theright hand. side of the controller casing is the reversin switch M of any desired ty e, movable y a handle M. tween t 's reversing switch and the main controller drum is provided interlocking mechanism, which, however, forms no part of the present invention and requires no descri tion herein.

h an modifications in the precise arra ment ere shown and described may made without departing from the s irit and scope of my invention, and in the ollowing claims I aim to cover all such modifications.

What I claim as new is 1. In a controller for electric motors, the combination of a controller drum, a shaft therefor, and two blow-out magnets, pole pieces of said magnets forming bearings for the controller shaft.

2. In a controller, the combination of a casing of magnetic material, extensions from said casing, blow-out coils on said extensions, and a controller drum the shaft of which is journaled in said extensions.

n ger c.-

3. In a controller, the combination of a casing of magnetic material, extensions from said casing, blow-out coils on said extensions, and a controller drum the shaft of which is journaled insaid extensions beyond said coils.

4. In a controller, the combination of a controller drum, a shaft of ma netic materialfrom the other poles of said magnets to the rear of said contact fingers.

6. In a controller, the combination ofcontact fingers, a rotatable drum, a shaft of ma 'netic material therefor, a casing of mag netic material, blow-out coils, extensions from said casing Which furnish cores for said coils, projections from said cores which furnish bearings for said shaft, and strips of magnetie material which extend from said casing to the rear of said contact fin ers.

7. In a controller, a plurality of low-out magnets, cores for said magnets, and a controller drum the shaft of which is/journaled in said cores.

8. In=a controller, a plurality of blow-out magnets, cores for said magnets, and a controller drum the shaft of which is journaled in the corresponding ends of said cores.

In testimony whereof I affix my signature, 5 in the presence of two Witnesses.

GEO/B. SGHLEY, "FRE J. KINSEY. 

